<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="item in list" :key="item.id">{{item.value}}
                <button @click="del(item.id)">删除</button>
            </li>
        </ul>
        <button @click="add">生成</button>
    </div>
    <script src="./vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                list: [{ id: 1, value: parseInt(Math.random() * 21) }, { id: 2, value: parseInt(Math.random() * 21) }, { id: 3, value: parseInt(Math.random() * 21) }, { id: 4, value: parseInt(Math.random() * 21) }, { id: 5, value: parseInt(Math.random() * 21) }]
            },
            methods: {
                add() {
                    this.list.push({ id: + new Date(), value: parseInt(Math.random() * 21) })
                },
                del(id) {
                    this.list = this.list.filter(item => item.id !== id)
                }
            }
        })
    </script>
</body>

</html>